Promising the Moon and Stars:
Net Headhunting Proliferates

F riday afternoons, as most offices begin winding down, Mark Calabrese gets down to the busiest deal-making of his week.

"I sit at my desk with the telephone. People are getting paid for the week, they're looking at the money on the check," says Mr. Calabrese, who heads a high-tech search firm called Calabrese Associates, in Greenwich, Conn. "They usually don't have any meetings going on Friday afternoons. They start...